1. chill out

Today we are going to learn “chill out”. It means that you should take it easy, calm down.
(1) A: I’m so angry I could punch something!
      B: You need to chill out a little bit, buddy.
(2) Chill out. Or you won’t be able to solve this problem.

2. turn in

Another word is “turn in”. It means to surrender someone or something to another
(1) A: When will you turn in your assignment?
      B: Next week.
(2) Also we will have students doing workshops and problem-solving where the students will solve problems as a group, and turn in a common work sheet.